In light of the operational character of existing quantum causal models, there have been proposals that we should seek more radical versions of nonclassical causal theories to characterise the reality underlying quantum mechanics. For example, ref [1]} sets out to find a way of unscrambling the purely inferential features of quantum mechanics and the features which `describe realities of nature,' where the latter are assumed to be described by a `realist causal theory.' Here it is argued that classical causal models aren't viable because of fine-tuning issues and no-go theorems, and that quantum causal models are not sufficiently realist, so we need to find some other kind of nonclassical causal theory to represent the realities of nature. Moreover, ref [1]} places great emphasis on the idea that this representation must still be sufficiently causal, noting that `Any attempt to provide a nonclassical generalization of the notions of causation and inference, however, is highly constrained insofar as it will need to preserve those features of these notions which one judges to be essential' and arguing that the nonclassical theory should contain `analogues of most, if not all, of the standard notions that arise in the framework of classical causal models: common causes, causal mediaries, d-separation, evaluation of counterfactuals.'
